On the thermally induced isomerisation of hexabromocyclododecane stereoisomers
- 21 February 2008
- journal article
- Published by Elsevier BV in Chemosphere
- Vol. 71 (4), 656-662
- https://doi.org/10.1016/j.chemosphere.2007.11.009
Abstract
The interconversion of the stereoisomers contained in technical 1,2,5,6,9,10-hexabromocyclododecane, a major brominated flame retardant increasingly found in the environment and in biota, was investigated at elevated temperatures. The application of pure enantiomers of the three constituents α-, β-, and γ-HBCD enabled the unambiguous elucidation of the individual isomerisation reactions as well as the quantification of all respective rate constants. At 160 °C the rate constants range over two orders of magnitude from 1.50 × 10−3 to 1.88 × 10−5 mol(%) s−1. A preliminary mechanistic explanation for the differences of the rate constants which govern the composition of HBCD diastereomers at equilibrium is given.Keywords
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